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LTC3526LB-2 の電気的特性と機能

LTC3526LB-2のメーカーはLinearです、この部品の機能は「550mA 2MHz Synchronous Step-Up DC/DC Converters」です。


製品の詳細 ( Datasheet PDF )

部品番号 LTC3526LB-2
部品説明 550mA 2MHz Synchronous Step-Up DC/DC Converters
メーカ Linear
ロゴ Linear ロゴ 




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LTC3526LB-2 Datasheet, LTC3526LB-2 PDF,ピン配置, 機能
Features
n Delivers 3.3V at 100mA from a Single Alkaline/
NiMH Cell or 3.3V at 200mA from Two Cells
n VIN Start-Up Voltage: 680mV
n 1.5V to 5.25V VOUT Range
n Up to 94% Efficiency
n Output Disconnect
n 2MHz Fixed Frequency Operation
n VIN > VOUT Operation
n Integrated Soft-Start
n Current Mode Control with Internal Compensation
n Burst Mode® Operation with 9µA IQ (LTC3526L-2)
n Low Noise PWM Operation (LTC3526LB-2)
n Internal Synchronous Rectifier
n Logic Controlled Shutdown (IQ < 1µA)
n Anti-Ring Control
n Low Profile (2mm × 2mm × 0.75mm) 6-Lead
DFN Package
Applications
n Medical Instruments
n Noise Canceling Headphones
n Wireless Mice
n Bluetooth Headsets
LTC3526L-2/LTC3526LB-2
550mA 2MHz Synchronous
Step-Up DC/DC Converters
in 2mm × 2mm DFN
Description
The LTC®3526L-2/LTC3526LB-2 are synchronous, fixed
frequency step-up DC/DC converters with output discon-
nect. Synchronous rectification enables high efficiency in
the low profile 2mm × 2mm DFN package. Battery life in
single AA/AAA powered products is extended further with
a 680mV start-up voltage and operation down to 500mV
once started.
A switching frequency of 2MHz minimizes solution foot-
print by allowing the use of tiny, low profile inductors
and ceramic capacitors. The current mode PWM design
is internally compensated, reducing external parts count.
The LTC3526L-2 features Burst Mode operation at light
load conditions allowing it to maintain high efficiency over
a wide range of load. The LTC3526LB-2 features fixed
frequency operation for low noise applications. Anti-ring
circuitry reduces EMI by damping the inductor in discon-
tinuous mode. Additional features include a low shutdown
current of under 1µA and thermal shutdown.
The LTC3526L-2/LTC3526LB-2 are housed in a 2mm ×
2mm × 0.75mm DFN package.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Patents pending.
Typical Application
2.2µH
VIN
1.6V TO 3.2V
4.7µF
OFF ON
SW
VIN VOUT
LTC3526L-2
SHDN FB
GND
1.78M
1M
33pF
VOUT
3.3V
200mA
4.7µF
3526lb2 TA01a
Efficiency and Power Loss vs Load Current
100
90
VIN = 2.4V
1000
80 EFFICIENCY 100
70
60 10
50
40
POWER LOSS
1
30
20 0.1
10
0
0.01
0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
3526lb2 TA01b
3526lb2fa


1 Page





LTC3526LB-2 pdf, ピン配列
Electrical Characteristics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3526LE-2/LTC3526LBE-2 are guaranteed to meet
performance specifications from 0°C to 85°C. Specifications over –40°C to
85°C operating temperature range are assured by design, characterization
and correlation with statistical process controls.
Note 3: Specification is guaranteed by design and not 100% tested in
production.
LTC3526L-2/LTC3526LB-2
Note 4: Current measurements are made when the output is not switching.
Note 5: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may result in device degradation or failure.
Note 6: Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
102°C/W.
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Efficiency
for VOUT =
vs Load Current and
1.8V (LTC3526L-2)
VIN
100 1000
90
80 100
70 VIN = 0.9V
60
50
VIN = 1.2V
VIN = 1.5V
10
40 1
30
20
10
0
0.01
PLOSS AT VIN = 0.9V 0.1
PLOSS AT VIN = 1.2V
PLOSS AT VIN = 1.5V 0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
3526lb2 G01
Efficiency
for VOUT =
vs Load Current and
3.3V (LTC3526L-2)
VIN
100 1000
90
80 100
70
60 10
50
40
30
20
10
0
0.01
VIN = 1.2V
VIN = 1.8V
VIN = 2.4V
VIN = 3.0V
1
PLOSS AT VIN = 1.2V
PLOSS AT VIN = 1.8V
0.1
PLOSS AT VIN = 2.4V
PLOSS AT VIN = 3.0V 0.01
0.1 1
10 100 1000
LOAD CURRENT (mA)
3526lb2 G02
No-Load Input
(LTC3526L-2)
Current
vs
VIN
100
90 VOUT = 5V
80
70 VOUT = 3.3V
60 VOUT = 2.5V
50 VOUT = 1.8V
40
30
20
10
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VIN (V)
3526lb2 G03
Efficiency vs Load Current and VIN
for VOUT = 5V (LTC3526L-2)
100 1000
90
80 100
70
60
50 10
40
30
1
20
10
0
0.01
0.1
0.1 1 10 100 1000
LOAD CURRENT (mA)
PLOSS AT VIN = 1.2V
PLOSS AT VIN = 2.4V
PLOSS AT VIN = 3.6V
PLOSS AT VIN = 4.2V
VIN = 1.2V
VIN = 2.4V
VIN = 3.6V
VIN = 4.2V
3526lb2 G04
Maximum Output Current vs VIN
400 VOUT = 3.3V
350 VOUT = 2.5V
300 VOUT = 1.8V
250
200
VOUT = 5V
150
100
50
L = 2.2µH
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VIN (V)
3526lb2 G05
Minimum Load Resistance
During Start-Up vs VIN
10000
VOUT = 3.3V
1000
100
10
0.65
0.75
0.85 0.95
VIN (V)
1.05 1.15
3526lb2 G06
3526lb2fa



3Pages


LTC3526LB-2 電子部品, 半導体
LTC3526L-2/LTC3526LB-2
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Load Step Response (from Burst
Mode Operation) (LTC3526L-2)
VOUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
VIN = 3.6V
100µs/DIV
VOUT = 5V
20mA TO 170mA STEP
COUT = 10µF
3526lb2 G19
Load Step Response
(Fixed Frequency)
VOUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
VIN = 3.6V
100µs/DIV
VOUT = 5V
50mA TO 150mA STEP
COUT = 4.7µF
3526lb2 G20
Load Step Response
(Fixed Frequency)
VOUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
VIN = 1.2V
100µs/DIV
VOUT = 3.3V
50mA TO 100mA STEP
COUT = 4.7µF
3526lb2 G21
Load Step Response (from Burst
Mode Operation) (LTC3526L-2)
VOUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
VIN = 1.2V
50µs/DIV
VOUT = 3.3V
5mA TO 100mA STEP
COUT = 10µF
3526lb2 G22
Pin Functions
SW (Pin 1): Switch Pin. Connect inductor between SW and
VIN. Keep PCB trace lengths as short and wide as possible
to reduce EMI. If the inductor current falls to zero or SHDN
is low, an internal anti-ringing switch is connected from
SW to VIN to minimize EMI.
GND (Pin 2, Exposed Pad Pin 7):Signal and Power Ground.
Provide a short direct PCB path between GND and the
(–) side of the input and output capacitors. The Exposed
Pad must be soldered to the PCB ground plane. It serves
as an additional ground connection and as a means of
conducting heat away from the package.
VIN (Pin 3): Input Supply Pin. Connect a minimum of 1µF
ceramic decoupling capacitor from this pin to ground
using short direct PCB traces.

SHDN (Pin 4): Logic Controlled Shutdown Input. There
is an internal 4MΩ pull-down on this pin.
SHDN = High: Normal operation
SHDN = Low: Shutdown, quiescent current < 1µA
FB (Pin 5): Feedback Input to the gm Error Amplifier. Con-
nect resistor divider tap to this pin. The top of the divider
connects to the output capacitor, the bottom of the divider
connects to GND. Referring to the Block Diagram, the output
voltage can be adjusted from 1.5V to 5.25V by:
VOUT
=
1.195V

1+
R2
R1
VOUT (Pin 6): Output voltage sense and drain of the internal
synchronous rectifier. PCB trace from VOUT to the output
filter capacitor (4.7µF minimum) should be as short and
wide as possible.
3526lb2fa

6 Page



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部品番号部品説明メーカ
LTC3526LB-2

550mA 2MHz Synchronous Step-Up DC/DC Converters

Linear
Linear


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